Power shovel



March 10, 1925- P. BURKE POWER SHOVEL Filed Dec. 30. 1922 2 Sheets-Sheet l INVENTOQ PMU@ EMA/LQ AT TORN E Y P. BURKE' POWER sHovEL Filed4 Dec. 30. 1922.

March l0, l925- 2 Sheets-Sheet 2 N l0 N N /NVENTOR vV/TN ESSES M Patented Mar. 10, 1925.

UNITED. STATES PATENT OFFlCE'.

PAUL BURKE, OF GREEN BAY, WISCONSIN, ASSIGNOR TO NORTHWEST ENGINEERING.

COMPANY, OF GREEN BAY, WISCONSIN, A CORPORATION O'F WISCONSIN.

POWER sHovEL. f

Application filed December 36, 1922. Serial No. 609,782.

To all whom t may concern.'

Be it known that I, PAUL BURKE, a citizen of the United 'States of America, and a resident of the city of Green Bay, Brown County, Wiscons'n, have invented certain new and useful Improvements in Power Shovels, of which the following isa specification.

This invention relates to power shovels, and more particularly to that typey of shovel in which the hoisting rope or cable is used.

to effect the thrust. l

The object of the invention is to provide a rope-thrusting shovel having a single part hoist line forlifting and thrusting the dipper and cooperating with other means vto effect the reciprocation of the dipper handle or stick, without the usual gear mechanism or rack and pinions or auxiliary driving apparatus of any kind.

A further object of the invention is to provide a novel construction of guiding mechanism for the dipper handle.

The invention further consists in the several features hereinafter set forth and more particularly defined by claims at the conclusion hereof.

In the drawings: Fig. 1 isa side elevation of a power shovel mechanism embodying the invention; Fig. 2 is a plan view thereof, partly in section; Fig. 3y is a vertical sectional view through the stick guiding mechanism; Fig. 4 is a detail side view of the saddle block and guide; Fig. 5 is a planl view, partly in section, of the structure shown lin Fig. 4 with the saddle block re-A moved.

In the drawings the numeral Gdesignates the boom, whidh may be of any suitable'construction, vertically pivotally attached at its lower end to the rotating base 7 of the machine, said base being of well-known construction. -A hoisting drum 8 and an auxiliary drum `9 are mountedv on the base 7 in any suitable manner and driven from the rime mover (not shown) on the base. The 1drums 8 and 9 may be of any well-known construction' equipped with clutches and brakes (not shown) of any standard or approved construction to control their operation. 'Ihe boom is adapted to be raised or lowered in various positions of vertical adjustment by any well-known means, such as a cable 10 connecting pulleys 11 at the outer end of the .boom to parts on the rotating base. The boom shownlis ofthe plate- `portions18 by U-bolts 19. The dipper han.

dle 12 is preferably a single member having a metal covering 20. This handle is mounted to slide between the 'adjacent saddle block 16 and a anged roller and sheave 2l loosely'mounted on the shaft 14. The dipper or shovel 22 'carried by the stick may be of any suitable construction.

The roller 21 is rovided with acable guide groove 23 recelving the cable 24 from the drum '9, said cable passing from said drum under a sheave 25, thence over roller The hoisting cable 28 passes from the drum 8 over a sheave 29 at the outer end of the boom 6 thence over the sheave 27 and up along thel stick through a slot 30 in the saddle block, then over the sheavc 26 and is then dead-ended on the boom. Thus, it

formed by passing around the pulley 26 has an end thrust engagement with the stick. The dead-end connection here shown comprises an eyed member 31 mounted on a pin 32 carried by extension arms 33 of the parts` 18 of the saddle whereby the cable anchorage turns with the saddle block when the dipperhandle swings, sleeves 34 positioning the member 31 centrally on the pin 32. The casting 35 at the upper end' of the stick and carrying the sheave 26 has a stop projection 36 that may engage the roller 21 to limit the outward movement of the stick..

With the construction above described, when the drum 9 is prevented from turning by its brake vtlierebygholding theline or cable 24.-, and the line 28 is pulled in, the dipper moves in the arc of a circle of which the dipper shaft is the. center. If it is desired to crowd further into the bank or move the-dipper farther out, as in loading a -will be noted that the bightof the cable wagon, the braking eli'ect on the line 24 is released slightly whereupon the line 28 pulling on the upper end of the dipper stick, through connections previously described, forces the dipper stick outward. Conversely, if it is desired to move the dipper farther in or toward the boom, releasing the brake 0n line 28 and pulling in on line 24C produces this elect. p tion and control ot the lines 24 and 28 any desired swinging or thrusting movement ot the dipper and its shaft may be effected. Furthermore, by the sheave arrangement above described the 'thrusting action is twice as great as the lifting action on the dipper. It will also be noted that the thrusting action on the dipper is proportional to the lo'ad upon the dipper and to the resistance and weight of the material it encounters during digging.

It will be furthernoted that the line 28 forms a single hoisting line from the hoisting drum to the dipper stick and that it is not wound around any of the sheaves over which it passes so that it will experience a minimum of wear.

The construction above described possesses the advantages of the usual and far more complicated shovels and yet is so simple that it will' not readily Vget out of order and, it it does, repairs can be made by even an unskilled mechanic.

I desire it to be understand that this invention is not to be limited to any particular arrangement or construction of parts eX- cept in so far as such limitations are specified in the claims.

What I claim as my invention is:

1. In an excavating shovel, the combination with the supporting boom, of a dipper and dipper handle mounted thereon to shift and swing with respect thereto, of. a dipper hoisting and thrusting cable having a bight in end-thrust engagement with said `dipper handle for crowding the dipper and another part for hoisting, and separate means for moving sai-d dipper inwardly.

2. In an excavating shovel, the combination with the supperting boom, of a dipper and dipper handle mounted thereon to shift and swing with respect thereto, of a dipper hoisting and thrusting cable having a bight in end-thrustl engagement with said dip er handle for crowding the dipper and anot erv part for hoisting, and another cable for /moving the dipper inwardly.

Thus, by the proper manipulal 3. In an excavating shovel, the combination with'the supporting boom, ofy a shipper shaft mounted on the boom, a4 flanged guide roller on said shaft for the dipper handle having a medial cable-receiving groove, a saddle-block on said shaft having a cable groove `in its transverse portion, a dipper handle mounted to slide between said roller and block, a hoisting drum, a cable extending 'from-said drum over vthe groove in said roller and connected to the lower end portion o't the dipper handle, sheaves at the upper, and lower end portions of the dipper handle, a sheave yon the outer end portion of the boom, a second hoisting drum, a

hoisting and tl'irusting cable passing 'from said drum .over the sheave on the boom, thence around the lower sheave on the handle and through the groove in said saddleblock and over the upper sheave on the handle to the boom, and a swinging anchorage connection with the boom for said lastnamed cable.

-fhIn an excavating shovel, the combination with the supporting boom, of a dipper and dipper handle mounted thereon 'to shift and swing with respect thereto, and a dipper hoisting and thrusting cable having a bight in end-thrust engagement with said dipper handle for crowding the dipper into the material to be excavated and another part for hoisting.

5. In a power shovel the combination of a boom, a dipper and dipper handle mounted thereon orswinging and bodily lengthwise shifting movements, a dipper hoisting cable connected at one end to said boom and intermediate its ends to said dipper to support the dipper, said dipper handle being associated with said cable intermediate said connections so as to shift said handle outwardly by the tension in said cable. and means for shifting said handle inwardly.

y6. In a power shovel the combination of a boom, a dipper and dipper handle mounted thereon for swinging and bodily lengthwise shifting movements, a sheave on the inner end of said'handle, a hoisting cable associated with the outer end of said handle to swing said handle 'and with said sheave to maintain an outward thrust on said handle, and a second cable associated with said handle for opposing said thrust to control the lengthwise shifting of said handle.

APAUL BURKE. 

